DeMar DeRozan added 20 points for Toronto, which increased its Atlantic Division lead to 2½ games over Brooklyn, which lost in Charlotte. The Raptors can clinch a playoff spot if the New York Knicks lose at Sacramento later Wednesday.

Jared Sullinger led Boston with 26 points, going 4 of 6 from 3-point range. Boston lost for the seventh time in eight games.

It was Lowry's eighth straight game of 20 or more points and helped the Raptors snap an 11-game losing streak in Boston.

Toronto captured its 19th road win, one off the club record set 2000-01.

Boston guard Rajon Rondo was cut on the forehead midway into the third quarter and received nine stitches. He returned to the bench early in the fourth quarter with a bandage that ran from the bridge of his nose straight up to his forehead and he re-entered the game with 8:05 to play.

The Raptors had opened a 79-64 lead early the fourth quarter, but Boston went on a 9-0 run. Toronto pushed it back to 85-75 before Sullinger nailed consecutive 3s 34 seconds apart, narrowing it to four points with just under 6 minutes to play.

Chris Johnson's basket - on an officials' reviewed goaltending call - closed it to 93-90 with 1:49 left, but Lowry and Ross hit consecutive 3s on the next two possessions to send the Raptors to the victory.

In the third quarter, Lowry nailed consecutive 3s on Toronto's first two possessions, pushing the Raptors' lead to 61-46. They held at least a nine-point lead for the rest of the quarter, opening it to 77-62 after Ross nailed a 3 at the buzzer.

Toronto, which blew an 11-point second-quarter lead in less than 2 minutes, held a 55-46 advantage at halftime.

NOTES: A few minutes before the opening tip-off and about 10 after the National Anthems were completed, the Celtics asked the crowd to rise for a moment of silence to honor two Boston firefighters that were killed battling a fire in the city's Back Bay section - about 2 miles away. ... Boston coach Brad Stevens praised Raptors G Lowry before the game. "(He) is playing terrific," Stevens said. "He was arguably an All-Star earlier. He makes a lot of plays that don't go talked about." ... Sullinger had 25 points and 20 rebounds when the Celtics beat the Raptors at home on Jan. 15. He had eight boards on Wednesday.